SIP Calculator: Mutual Fund Returns with Step-Up

#How SIP returns are calculated

A SIP (systematic investment plan) puts a fixed amount into a mutual fund every month. Each instalment then grows for the months that remain. The calculator assumes you invest at the start of each month and that returns compound monthly at the yearly rate you choose:

Future value = P × [((1 + r)ⁿ − 1) ÷ r] × (1 + r)

where P is the monthly amount, r the monthly return and n the number of months. With a step-up, the monthly amount rises by your chosen percentage every 12 months.

Example: ₹10,000 a month for 15 years at 12% grows to about ₹50 lakh on ₹18 lakh invested. Add a 10% yearly step-up and the same plan reaches roughly ₹87 lakh — on about ₹38 lakh invested.

#What return should you assume?

Nobody can promise a return. As a rough guide for long periods (10+ years): large-cap equity funds 10–12%, flexi- and mid-cap funds 11–14% with bigger swings, hybrid funds 8–10%, and debt funds 6–7.5%. For a goal that matters, plan with a conservative number and treat anything extra as a bonus.

Warning: Equity funds can fall 20–40% in a bad year. A SIP helps because you buy more units when prices are low, but you still need time — at least 5–7 years for equity.

#SIP vs lump sum

If you already have the money, a lump sum invested at once has historically beaten a SIP more often than not, simply because more money is invested for longer. A SIP is better for regular income and for controlling the fear of investing at a market peak. Read the full comparison in SIP vs lump sum, and see why time matters so much in compound interest explained.

#How mutual fund gains are taxed

For equity funds, gains on units held over 12 months are long-term and taxed at 12.5% on gains above ₹1.25 lakh a year; units sold within 12 months are taxed at 20%. Debt funds bought after 1 April 2023 are taxed at your slab rate. Each SIP instalment has its own holding period.

#Frequently asked questions

What is a step-up SIP?

A SIP whose monthly amount rises by a fixed percentage each year, for example 10%. It lets your investing keep pace with salary growth and makes a large difference over 15–20 years.

Is 12% return realistic for a SIP?

It has been achievable over long periods for diversified equity funds in India, but it is not guaranteed and some 10-year periods returned much less. Try 8% and 10% in the calculator to see a cautious range.

Can I stop a SIP anytime?

Yes. Open-ended mutual fund SIPs can be paused or cancelled without penalty; only ELSS units have a three-year lock-in.

Does the calculator include expense ratio and tax?

No. Use a return that is already net of the fund's expense ratio, and remember that tax applies when you redeem.

#Sources

• SEBI — investor education on mutual funds
• AMFI — mutual fund basics
• Income Tax Department — capital gains